It's after the resignation of Edouard Philippe who has been in the post for three years.
Mr Castex, 55, is relatively unknown in France, although he is a senior civil servant.
The new Prime Minister has been a key player in the government's response to the Covid-19 pandemic.
Venezuela says 116 prisoners released, rights groups cite much lower figures
Venezuela's government has announced on Monday that 116 prisoners have so far been released as part of process announced last week, though rights groups reported a lower figure as family members of the detained awaited liberations, with some sleeping outside prisons.
Australian writers festival in turmoil over decision to bar Palestinian author
The director of one of Australia's top writers festivals has resigned on Tuesday saying she could not be party to silencing a Palestinian author and warning government moves to ban protests and slogans in the aftermath of the Bondi mass shooting threatened free speech.
Four migrants die in US immigration custody over first 10 days of 2026
Four migrants have died while in custody of US immigration authorities over the first 10 days of 2026, according to government press releases, a loss of life that followed record detention deaths last year under President Donald Trump.
Landmark Myanmar Rohingya genocide case opens at UN's top court
A landmark case accusing Myanmar of committing genocide against minority Rohingya opened at the United Nations' top court on Monday.
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